Change in Carrying Amount of Deferred Acquisition Costs (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
DAC
Capitalization		$ 14	$ 17	$ 34
Accretion (amortization) expense	$ (1,374)	(3,548)	(3,203)	(3,964)
Unlocking	235	1,552	327	1,526
Change in DAC carrying amount	$ (1,139)	$ (1,982)	$ (2,859)	$ (2,404)

Deferred Policy Acquisition Cost, Amortization Expense and Adjustment

No definition available.

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- Definition

Amount of amortization expense (reversal of amortization expense) of deferred policy acquisition costs from a revision in estimated gross profit or estimated gross margin.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 30
-Section 35
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=95462302&loc=d3e10129-158409

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415

+ Details

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- Definition

Total amount of policy acquisition costs capitalized during the income statement period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415

+ Details

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- References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in deferred policy acquisition cost.

+ References

No definition available.

+ Details

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